3Recognized for having the largest known cave system in the world, Mammoth Cave National Park, in southwestern Kentucky, has become a destination for nearly two million recreationalists every year. Exploring Mammoth Cave National Park, 2nd covers in detail all of the aboveground and belowground activities in this 50,000-acre national park, including hiking, biking, scenic driving, camping, paddling, fishing, and of course, caving.